Description of 100% L-Glutamine | glutamine powder
Short summary
BioTechUSA 100% L-Glutamine contains pure L-glutamine without flavorings, sweeteners, colorants or other additives. It is designed for athletes and active individuals during periods of more intense training who want to support post-workout recovery and supplement their intake of an amino acid naturally present in muscle tissue.
6.2 / 10Our expert rating
Ingredient quality7.0
Formula transparency10.0
Effectiveness1.8
Safety10.0
Independent testing1.0
How to use
Mix 5 g (1 teaspoon) with a glass of water and consume in the morning on an empty stomach, after training, or before bed - choose whichever time suits you best. It is most commonly used after training, when recovery processes are underway. A single daily dose is at the lower end of the dosage range used in research (5-10 g/day), so you can add an additional dose if needed.
Pros and Cons
Pure L-glutamine without sugar, flavorings or sweeteners
Neutral taste, easy to mix with protein shakes, juices or smoothies
Established international brand with a long-standing presence on the market
5 g of glutamine per dose, in line with dosages used in research
The product contains glutamine exclusively, without additional amino acids or electrolytes for comprehensive recovery
Without flavoring, the taste may be less pleasant for some users
Scientific support for the effect on strength and body composition in healthy, trained adults is limited (Candow et al., 2001)
Despite the established brand, there is no independent laboratory test report published on the product page
Suitable for
Individuals with intensive strength training
Athletes during competition preparation periods
People who train several times a week and need extra recovery support
Vegans and vegetarians
There is no publicly available, batch-specific independent laboratory report published on the product page, so this cannot be confirmed based on the available information. Large, established brands often have their own internal quality standards (GMP-compliant manufacturing), but this is not the same as independent testing by an external laboratory. Risk assessments of amino acid supplements such as glutamine generally place this ingredient among the safer ones at oral doses compared to typical dietary supplements (Shao and Hathcock, 2008), but this applies to the ingredient itself, regardless of brand.
All three times are fine, as the exact timing of glutamine intake is not a key factor - what matters more is reaching your total target dose over the course of the day. Some users prefer taking it after training, since that's when recovery processes take place, while others prefer taking it in the morning on an empty stomach or before bed for easier inclusion in their daily routine. Choose the time you'll be able to follow most consistently - consistency of daily intake matters more than the exact hour of consumption.
A single 5 g dose is at the lower end of the range most commonly used in sports supplementation research - approximately 0.1-0.3 g per kilogram of body weight per day, which for an average adult corresponds to roughly 5-10 g per day. If you weigh around 70-80 kg, one dose will get you to the lower part of this range; for the upper part you would need to take two doses daily. Since glutamine is a relatively weakly supported ingredient in the context of muscle growth even at higher doses (Candow et al., 2001), a higher dose does not in itself guarantee a proportionally greater benefit.
If you have any chronic illness, especially liver disease, or regularly take medication, consult a doctor before use. In people with advanced liver cirrhosis, glutamine can worsen hepatic encephalopathy, as it is metabolized into glutamate and ammonia, which has been documented in this group to be associated with elevated serum ammonia and impaired cognition (LiverTox / NCBI Bookshelf). For healthy adults without these conditions, glutamine at the doses used in research is generally considered safe and well tolerated, but always leave general health advice to your doctor, not to a dietary supplement.
May contain traces of milk, eggs, gluten-containing cereals, soy, peanuts, nuts, celery, fish, crustaceans and sulphur dioxide.
The recommended daily dose must not be exceeded
Individuals with liver impairment (e.g. cirrhosis) or other chronic conditions should consult a doctor before use
Pregnant and breastfeeding women should consult a doctor before use
Ingredients
L-glutamine 100%. Manufactured in an environment that processes milk, eggs, gluten, soy, peanuts, nuts, celery, fish, crustaceans and sulphur dioxide.
Form:Powder
Dose:5 g
Available flavors:Unflavored
L-glutamine:5 g
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